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Determination of Crystal Structures01:29

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Radiation-Hardened Position-Sensitive Photodetector Based on Undoped 4H-SiC.

Miaomiao Yang1, Haoran Mu2, Yanxia Cui1

  • 1College of Physics and Optoelectronics, Key Laboratory of Interface Science and Engineering in Advanced Materials, Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China.

ACS Applied Materials & Interfaces
|February 26, 2025
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Summary

This study introduces a new silicon carbide position-sensitive photodetector (PSD) that offers stable light tracking in extreme environments. The robust 4H-SiC PSD demonstrates high spatial resolution and resilience to radiation damage.

Keywords:
4H-SiChigh performanceposition trackingposition-sensitive photodetectorradiation-prone

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Semiconductor Devices

Background:

  • Conventional position-sensitive photodetectors (PSDs) face limitations in extreme environments due to radiation damage and material degradation.
  • Silicon carbide (SiC) presents a promising alternative owing to its wide bandgap, high mobility, and radiation resistance.

Purpose of the Study:

  • To develop and characterize a robust position-sensitive photodetector (PSD) using undoped 4H-silicon carbide (SiC).
  • To evaluate the performance and stability of the 4H-SiC PSD under harsh conditions, including gamma-ray irradiation.

Main Methods:

  • Fabrication of a simple vertical-structure PSD using undoped 4H-SiC.
  • Performance testing including light on-off ratio, spatial resolution, and response time measurements.
  • Assessment of device stability under 300 krad gamma-ray irradiation.

Main Results:

  • The 4H-SiC PSD achieved a light on-off ratio > 10^3 with sub-milliwatt illumination.
  • Demonstrated excellent spatial resolution of approximately 0.1 μm and fast response times (~10 μs rise, ~6.3 μs fall).
  • Exhibited remarkable stability under gamma-ray irradiation, with minimal photocurrent variation.

Conclusions:

  • Undoped 4H-SiC is a viable material for creating high-performance, radiation-hardened PSDs.
  • The developed 4H-SiC PSD offers a robust solution for accurate position tracking in radiation-prone and extreme environments.
  • This technology holds potential for advanced sensing applications requiring high resilience and performance.